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public class MultiDataSource extends AbstractRoutingDataSource {

    private static final ThreadLocal<String> dataSourceKey = new InheritableThreadLocal<>();

    public static void setCurrentDataSource(String dataSource)
    {
        dataSourceKey.set(dataSource);
    }

    public static String getDsKey(){
        return dataSourceKey.get();
    }

    @Override
    protected Object determineCurrentLookupKey() {
        return dataSourceKey.get();
    }
}

 MultiDataSource.setCurrentDataSource(DataSourceKey.DAP);